<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="viewport" content="width=device-width,initial-scale=1.0">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge"/>
    <title>v-for</title>
</head>
<body>
    <div id="app">
        <input type="button" value="添加数据" @click="add">
        <input type="button" value="移除数据" @click="remove">
        <ul>
            <li v-for="it in arr">
              {{ index+1 }}  黑马程序员校区：{{ it }}
            </li>
        </ul>
        <h2 v-for="item in vegetables" v-bind:title="item.name">
            {{ item.name }}
        </h2>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        var app=new Vue({
            el:"#app",
            data:{
               arr:["北京","上海","广州","深圳"],
               vegetables:[
                {name:"西兰花炒蛋"},
                {name:"蛋炒西兰花"} 
            ]
            },
            methods:{
                add:function(){
                    this.vegetables.push({name:"花菜炒蛋"});
                },
                remove:function(){
                    this.vegetables.shift();
                }
            },
        })
    </script>
</body>
</html>